WM9715L
Production Data
SPEAKER MIXER
The speaker mixer drives the LOUT2 and ROUT2 output. The following signals can be mixed into the
speaker path:
•
•
•
•
•
PHONE (controlled by register 0Ch, see “Audio Inputs”)
LINE_IN (controlled by register 10h, see “Audio Inputs”)
the stereo DAC signal (controlled by register 18h, see “Audio DACs”)
PC_BEEP (controlled by register 0Ah, see “Audio Inputs”)
the AUXDAC signal (controlled by register 12h, see “Auxiliary DAC”)
In a typical smartphone application, the speaker signal is a mix of AUXDAC (for system alerts or ring
tone playback), PHONE (for speakerphone function), and PC_BEEP (for externally generated ring
tones).
MONO MIXER
The mono mixer drives the MONOOUT pin. The following signals can be mixed into MONOOUT:
•
•
•
•
•
•
LINE_IN (controlled by register 10h, see “Audio Inputs”)
the output of the Record PGA (see “Audio ADC”, “Record Gain”)
the stereo DAC signal (controlled by register 18h, see “Audio DACs”)
the MIC signal (controlled by register 10h, see “Audio Inputs”)
PC_BEEP (controlled by register 0Ah, see “Audio Inputs”)
the AUXDAC signal (controlled by register 12h, see “Auxiliary DAC”)
In a typical smartphone application, the MONOOUT signal is a mix of the amplified microphone
signal (possibly with Automatic Gain Control) and (if enabled) an audio playback signal from the
stereo DAC or the auxiliary DAC.
SIDE TONE CONTROL
The side tone path is into the headphone mixer and is either from the MIC or ALC path (with no 20dB
boost)
REGISTER
ADDRESS
BIT
LABEL
STM
DEFAULT
DESCRIPTION
14h
15
1
MIC side tone select
Sidetone
Control
0: selected
1 : not selected (path muted)
MIC Sidetone volume
000 : +6dB (max.)
001: +3dB
14:12
11:10
9:7
STVOL
ALCM
010
(0dB)
… (3dB steps)
111 : -15dB (min.)
ALC side tone select
11: mute
11
10: mono – left
01: mono – right
00: stereo
ALCVOL
010
ALC Sidetone volume
Similar to STVOL
(0dB)
Table 21 Side Tone Control
PD Rev 4.0 December 2007
36
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
